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How do Tankless Water Heaters work?

Electric Demand Water Heater Tankless Water Heaters heat water directly without the use of a storage tank. Therefore, they avoid the standby heat losses associated with storage water heaters. When a hot water tap is turned on, cold water travels through a pipe into the unit. In an electric Tankless Water Heater an electric element heats the water. In a gas-fired Tankless Water Heater a gas burner heats the water. As a result, Tankless Water Heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water. Typically, Tankless Water Heaters provide hot water at a rate of 2 - 5 gallons (7.6 - 15.2 liters) per minute. Typically, gas-fired Tankless Water Heaters will produce higher flow rates than electric Tankless Water Heaters. Some smaller Tankless Water Heaters, however, cannot supply enough hot water for simultaneous, multiple uses in large households. For example, taking a shower and running the dishwasher at the same time can stretch a Tankless Water Heater to its limit. To overcome this problem, you can install a "whole house" type Tankless Water Heater or install two or more Tankless Water Heaters, connected in parallel for simultaneous demands of hot water. You can also install separate Tankless Water Heaters for appliances--such as a clothes washer or dishwater--that use a lot of hot water in your home.

Other applications for Tankless Water Heaters include the following:

  • Remote BBQ or outdoor sink
  • Poolhouse or pool shower
  • Remote bathrooms or hot tubs
  • To serve as a booster, eliminating long pipe runs, for solar water heating systems, dishwashers and sanitation

Tankless Water Heater Dishwasher Application Tankless Water Heater Bathroom and Kitchen Application

For homes that use 41 gallons or less of hot water daily, Tankless Water Heaters can be 24% - 34% more energy efficient than conventional storage tank water heaters. They can be 8% - 14% more energy efficient for homes that use a lot of hot water, around 86 gallons per day. You can achieve an even greater energy savings of 27% - 50% if you install a Tankless Water Heater at each hot water outlet.

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